18. Body elongate, cylindrical, parallel-sided for majority of length (Fig. 82); metafemur parallel-sided, not swollen ................. Pleurophorus caesus (Panzer)

- Body more robust, not elongate (Figs. 78–81, 83); metafemur swollen, at most weakly parallel-sided .................................................................................... 19

Fig. 78. Leiopsammodius indefensus habitus; Fig. 79. Leiopsammodius placidus habitus (holotype); Fig. 80. Odontopsammodius cruentus habitus; Fig. 81. Platytomus micros habitus; Fig. 82. Pleurophorus caesus habitus; Fig. 83. Tesarius caelatus habitus.

20. Metatibia with complete transverse ridge near middle (Fig. 30); eyes reduced (Fig. 29); flightless .............................................. Tesarius caelatus (LeConte)

- Metatibia lacking complete transverse ridge, possibly with transverse row of teeth; eyes normally developed (Figs. 31–32); flightless or not .................................. 21

Fig. 29. Tesarius caelatus head to elytral base; Fig. 30. Tesarius caelatus metafemur and tibia; Fig. 31. Leiopsammodius indefensus head to elytral base; Fig. 32. Leiopsammodius placidus (holotype) head to elytral base. Scale line = 0.2 mm.

21. Elytra lacking setae on lateral margin; base of head roughly punctate, lacking grooves (Figs. 32–33); pronotum grooves weak .............................................. 22

- Elytra with distinct, long setae on lateral margin (Fig. 78); base of head with angled grooves (Figs. 31, 78); pronotum with one longitudinal groove on midline and 2 transverse grooves on each side (Figs. 31, 78) ......................................................... Leiopsammodius indefensus (Schmidt)

Fig. 31. Leiopsammodius indefensus head to elytral base; Fig. 32. Leiopsammodius placidus (holotype) head to elytral base; Fig. 33. Platytomus micros head to elytral base. Scale line = 0.2 mm. Fig. 78. Leiopsammodius indefensus habitus.

22. Body more elongate, elytra parallel-sided (Fig. 81); clypeus rounded on each side of central emargination; pronotal lateral margin lacking fringe of setae (Fig. 33) ............................................................................ Platytomus micros (Bates)

- Body more globose, elytra not parallel-sided (Fig. 79); clypeus angulate on each side of central emargination; pronotal lateral margin with distinct fringe of setae (Fig. 32) ................................................ Leiopsammodius placidus (Schmidt)

Fig. 32. Leiopsammodius placidus (holotype) head to elytral base; Fig. 33. Platytomus micros head to elytral base. Scale line = 0.2 mm. Fig. 79. Leiopsammodius placidus habitus (holotype); Fig. 81. Platytomus micros habitus.